The only reason not to do this is if the kernel is <5.2. It should be enabled by default in all other cases. This would only matter on Bionic which may have such a kernel. Focal-Usuri on should always have this supported as 5.4 is the default kernel there.
So +1 to enable by default on Usurri except it would need some logic for detecting bionic-usurri installs and not enabling it in that case unless it has a new enough kernel.
The only reason not to do this is if the kernel is <5.2. It should be enabled by default in all other cases. This would only matter on Bionic which may have such a kernel. Focal-Usuri on should always have this supported as 5.4 is the default kernel there.
So +1 to enable by default on Usurri except it would need some logic for detecting bionic-usurri installs and not enabling it in that case unless it has a new enough kernel.